<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
<div style="margin: 0 auto; background-color: #ccc;">
    <div style="width: 200px; height: 100px; float: left; background-color: #95f49e;">left</div>
    <div style="background-color: #fff; height: 100px; border: 1px solid #ccc;">right</div>
</div>
	
</body>
</html>